Method of making sand molds



J. TOOLE.

METHOD OF MAKING SAND MOLDS.

APPLICATION FILED Aue.2, 1920.

' 1,369, 947. I Patented Mar-J 1, 1921.-

uarrao INT I C E JOHN TooLE, or vEnoNA, PENNSYLVANIA. assIer oa To UNI NSTEEL CASTING COMPANY; or PITTSBURGH, rENNsYLvANIa, A CORPORATION OFPENNSYLf VANIA.

T 0 all whom it may concern I Be it known that I, JoH -TooLn, a residentof Verona, in the county of Allegheny and State of Pennsylvania, haveinvented a new and useful Improvement in' Methods of Making Sand Molds,of which the following is a specification. I

In making large castings, such for example as locomotive frames and thelike, it is necessary to remove the cope from the drag shortly after thecasting has set. in order to permit unrestricted shrinking of 'thecasting and thereby prevent the setting up of internal strains. In theprevailing foundry practices it is necessary, before the cope isremoved, for workmen to stand upon the mold and either loosen the sandand remove the gaggers around the risers and pouring gate, or removespecial fillers surrounding the risers. Because of the intense heat ofthe casting this isa difficult and much disliked task.

The object of this invention is to provide a method of making sand moldswherein, previous to the removal of the cope, it is unnecessary forworkmen to stand upon'the molds in order to remove the sand and gaggersadjacent to riser or feeding heads, or to loosen and remove specialfillers placed around risers and gate.

The method may be understood by reference to the accompanying; drawingswhich show apparatus for practising it. Figure 1 is a plan View of aportion of the cope of a flask prepared for the ramming up of sandsurrounding a riser print; Fig. 2 a sectional View taken on the lineII-II, Fig. 1; Fig. 3 a view corresponding to Fig. 1 showing the mold inreadiness for the casting operation; and Fig. 4 a sectional view takenon the line IVIV Fig. 3.

The mold shown herein may, for example, be considered as a portion of amold for easting a locomotive frame. In practising the invention a drag1 containing a pattern 2 may be rammed up in the usual manner withproperly tempered sand 3. Thereafter the cope is formed on the top ofthe pattern and around a riser print or prints of materially greatersize than the riser. The cope and drag are then separated and thepattern removed from the drag and the riser prints METI ioD or MAKINGSAND MOLDS. Y

Specification of Letters Patent. 7 P tent d Man 1, 1 2 Application filedAugust 2, 1920. Serial No. 400,680. k

placed in each opening previously formed v by the riser prints atubularcore of internal size to correspond with the desired riser andexternally of smaller size than such opening. If desired the spacesurrounding the riser core and between it and the wall of the-cope maybe filled with loose sand. It has been found that by so forming the moldthe cope may be readily removed from the drag at any time after thecasting has set, and this without requiring the presence of workmen uponthe hot mold.

Having reference again to the drawings, before the cope a is rammed up,suitable riser print pads 5' are placed upon the pattern and drag,.andupon such pads the riser prints 6 are placed. The gaggers 9 being placedin position, the cope is then rammed up, after which it is engaged byits lugs 15 and lifted so that the pattern 2 may be removed from thedrag. The riser print 6 is also removed from the cope, andfor itscareful manipulation during such removal it may be provided with ahandle 10.

Before assembling the cope with thedrag to form the mold cavity, a risercore support 11 is placed in the position of the riser print pad 5, suchcore support having a restricted opening 12 for the upward flow of metalto form the riser. After assembling the cope with the drag the riserprint core 14, of smaller size than the opening formed by the riserprint, is placed in such opening, I there being left an annular space 13between the wall of such opening and the outer wall forms a closure forthe bottom of this annular space and projects beyond the wall of theopening. If desirable, this space may be filled with loose sand toprevent displacement of the riser core.

After the metal has been poured and has become sufliciently set tomaintain its form, the cope maybe easily removed from the drag, theriser core and the loose sand surrounding it offering no resistance tosuch removal. Thus by forming the mold in the manner explained, workmenare not required to stand upon the hot mold to prepare the cope for itsremoval.

What has been explained with reference to the riser or risers is alsoapplicable to similar cores and core supports for the gates or runnersof molds.

According to the provisions of the patent 110 of the tubular core. Theriser core support statutes, I have described the principle and claims,the invention may bepractised otherwise than as specifically describedand illustrated, as well as in the formation of molds for casting otherarticles than specifically mentioned. I

I claim: 7

1. The method of making sand molds, consisting in forming a cope on apattern and around a riser print of materially greater size than theriser, removing the pattern and riser print from the cope, assemblingthe cope with a drag, and placing in the opening formed by the riserprint a tubular core of internal size to correspond with the riser andexternally of smaller size than said opening, whereby a surface ofcleavage is directly formed around the riser permitting the unobstructedremoval of the cope after the casting operation.

2. The method of making sand molds, consisting in forming a cope on apattern and around a riser print of materially greater size than theriser, removing the pattern and riser print from the cope, assemblingthe cope with a drag, placing in the opening formed by the riser print atubular core of internal size to correspond with the riser andexternally of smaller size than said opening, and filling With-loosesand the space in the copeoutside of the-core, whereby a surface ofcleavage is directly formed around the riser permitting the unobstructedremoval of the cope after the casting operation.

3. The method of making sand molds, consisting in forming a cope on apattern and around a riser print of materially greater size than theriser, removing the pattern and riser print; from the cope, assemblingthe cope With a drag, placing in the bottom of i the opening formed bythe riser print a core support, placing in said opening and on saidsupport a tubular core of internal size to correspond with the riser andexternally or" smaller size than said opening, and filling with loosesand the space in the cope outside of the core, whereby a surface ofcleavage is directly formed around the riser permitting the unobstructedremoval of the cope after the casting operation.

In testimony whereof, I have hereunto set my hand.

JOHN TOOLE.

Witnesses J. B. HENRY, J. P. TEIF.

